Best Steam Includes Source SDK Games

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Name Release Date Current Players All-Time Peak Rating
Left 4 Dead 2 Left 4 Dead 2 16 Nov, 2009 25 642 162 399 96.78
Garry's Mod Garry's Mod 29 Nov, 2006 13 106 73 863 96.09
Counter-Strike: Source Counter-Strike: Source 1 Nov, 2004 4 201 100 056 95.06
Half-Life 2 Half-Life 2 16 Nov, 2004 1 167 64 085 96.46
No More Room in Hell No More Room in Hell 31 Oct, 2013 509 10 922 88.53
Black Mesa Black Mesa 6 Mar, 2020 397 7 158 93.93
Left 4 Dead Left 4 Dead 17 Nov, 2008 382 30 616 94.64
Portal Portal 10 Oct, 2007 303 20 672 97.19
Day of Defeat: Source Day of Defeat: Source 12 Jul, 2010 181 7 507 89.63
Alien Swarm: Reactive Drop Alien Swarm: Reactive Drop 20 Apr, 2017 129 9 335 92.73
Menace from the Deep Menace from the Deep 2024 95 1 653 81.25
Half-Life 2: Deathmatch Half-Life 2: Deathmatch 1 Nov, 2004 89 2 702 88.45
Entropy : Zero 2 Entropy : Zero 2 20 Aug, 2022 70 3 751
Pool Nation FX Lite Pool Nation FX Lite 7 Dec, 2015 56 1 271 70.31
Treason Treason 31 Jan, 2023 51 226
Synergy Synergy 3 Oct, 2008 47 2 940 88.30
Astro Colony Astro Colony 7 Nov, 2022 46 2 751 79.05
Selaco Selaco 30 May, 2024 45 1 528 88.37
Fistful of Frags Fistful of Frags 9 May, 2014 42 3 537 89.59
Half-Life 2 RTX Half-Life 2 RTX Coming soon 25 3 802
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